Eliminates the recurring -Dupdate-goldens churn: these 5 were 0-byte
outliers while 484 other empty goldens use the writeGolden-produced
1-byte "\n" form. The corpus runner trims trailing newlines on both
sides during verify, so both forms passed — but regen always rewrote
them to 1-byte. Conforming them makes -Dupdate-goldens idempotent.
example/1227 exposes the sx fn `sx_triple` to C under the symbol `triple_c`
via `export "triple_c"`; the companion C calls `triple_c` by that name.
RED: the define path emits the fn under its sx name (`sx_triple`) and
ignores the parsed `extern_name`, so the C reference to `triple_c` is
undefined at AOT link. The next commit consumes the rename on the define
path (gap iii) and greens it.